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GB936810A - An automatic telephone system - Google Patents

An automatic telephone system

Info

Publication number
GB936810A
GB936810A GB40024/60A GB4002460A GB936810A GB 936810 A GB936810 A GB 936810A GB 40024/60 A GB40024/60 A GB 40024/60A GB 4002460 A GB4002460 A GB 4002460A GB 936810 A GB936810 A GB 936810A
Authority
GB
United Kingdom
Prior art keywords
signal
digit
relays
received
exchange
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB40024/60A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Priority to SE1139060A priority Critical patent/SE219742C1/sv
Publication of GB936810A publication Critical patent/GB936810A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
    • H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
    • H04Q1/45—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling
    • H04Q1/453—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using multi-frequency signalling in which m-out-of-n signalling frequencies are transmitted
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/0016—Arrangements providing connection between exchanges

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Telephonic Communication Services (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
  • Exchange Systems With Centralized Control (AREA)

Abstract

936,810. Automatic exchange systems. TELEFONAKTIEBOLAGET L. M. ERICSSON. Nov. 21, 1960 [Nov. 19, 1959], No. 40024/60. Class 40 (4). In an inter-exchange system employing VF signalling in which each digit is represented by one or more frequencies, each digit is sent until it is terminated by a return signal from the receiving exchange, whereupon the return signal is cut off in turn and the next digit is sent. Digit sending may be initiated by a " ready " signal from the receiving exchange. Receiving equipment including registers is shown for signals comprising a 2 out of 6 code with relays R1 . . . R6 corresponding to the six frequencies. If more than two frequencies are received R12 operates, while if only one frequency is received R 13 operates, an alarm circuit AL being closed in either case. Assuming a correct signal is received, the corresponding relays in register RE1 operate as well as R8, and these relays connect up R11 to send a return signal. R11 holds over its lower winding during the operating time of R10, which fixes a minimum duration for the return signal, and over its upper winding in series with the operated pair of relays R1 . . . R6 until the received signal is ended. R11 and R10 then fall back and R9 comes up, the digit represented by the next signal being stored in register RE2. In an alternative arrangement, a signal is normally transmitted from the receiving exchange, and its interruption constitutes the acknowledgment of a correct digital signal.
GB40024/60A 1959-11-19 1960-11-21 An automatic telephone system Expired GB936810A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
SE1139060A SE219742C1 (en) 1960-11-21 1960-11-25

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE1084659 1959-11-19

Publications (1)

Publication Number Publication Date
GB936810A true GB936810A (en) 1963-09-11

Family

ID=20292927

Family Applications (1)

Application Number Title Priority Date Filing Date
GB40024/60A Expired GB936810A (en) 1959-11-19 1960-11-21 An automatic telephone system

Country Status (4)

Country Link
US (1) US3198886A (en)
DE (1) DE1123711B (en)
GB (1) GB936810A (en)
NL (1) NL257575A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1171475B (en) * 1962-09-14 1964-06-04 Standard Elektrik Lorenz Ag Forced signal procedure with multi-frequency code characters for telecommunications, especially telephone systems
US3288940A (en) * 1963-10-24 1966-11-29 Automatic Elect Lab Multifrequency signal receiver

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR959077A (en) * 1942-10-31 1950-03-23
US2767248A (en) * 1952-06-27 1956-10-16 Siemens Brothers & Co Ltd Electrically operated registers
BE559666A (en) * 1956-08-01
US2921986A (en) * 1957-07-15 1960-01-19 Leich Electric Co Crossbar relay private branch exchange telephone system
US2897283A (en) * 1958-04-18 1959-07-28 Gen Dynamics Corp Multioffice interlocked signaling telephone system

Also Published As

Publication number Publication date
DE1123711B (en) 1962-02-15
US3198886A (en) 1965-08-03
NL257575A (en)

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